We had this discussion 4 years ago. Why bring it up again now? Because several big CodeCanyon projects are coming to Drupal soon and I think it will have an impact. One of them is Slider Revolution. Slider Revolution is an "All-purpose Slide Displaying Solution that allows for showing almost any kind of content with highly customizable transitions, effects and custom animations". With nearly 60.000 sales at 18 USD it's the second most popular Wordpress plugin on codecanyon. The number of sites using this module is much greater because hundreds of premium Wordpress themes ship with the slider built into the theme.
To refresh our memories here are some quotes from 2011:
the DrupalAppStore that killed drupal